Rather than checking for the absence of maintenance_mode?: true, check
for the presence of maintenance_mode?: false, which is more robust. Also
discard jq's stdout/stderr when doing the status check, since we don't
care about it.

Tagging as latest was accidentally added during a recent refactor.
We don't need to deal with "latest" in Azure for PuppetDB because the
latest tagging will happen during "make publish" after the tests pass,
which is currently only called by the Distelli/Pipelines CI.